Process of manufacturing nitrate fertilizers.



- tivcly expensive cnun cvanan'iid.

EMIL COLLET'J. AND MORITZ ECKARDT, OF CHRISTIANIA, NORWAY.

PROCESS OF MANUFACTURING NITRATE FERTIIIZERS No Drawing.

K To all whom it may concern:

Be it known that Morirrz EQKARDT, Norway, residing have invented certain new and useful Improvements in Processes off-Manufacturing Nitrate Fertilizers; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it a ppertains to make and use the same.

ur invention has for its object to provide a process for manufacturing nitrate fertilizers. i

Calciumcyanamid possesses certain properties which have a somewhat unfavorable influence upon the value of the substance as a fertilizer, and it would be of very great advantage, if this important nitrogen carrier could be transferred into a form, which could be easily and advantageously sold as a fertilizer, and several attempts have been made to that eli'ect. These attempts how ever have proved more or less inetficient, because they have been based upon the cooperation and consumption of comparasubstances and also because they do not provide any profitable use of the valuable content of calcium in the cal- Thus it has been proposed ammonia from the calcium cyanamid by means of decomposition with water and. absorbing the ammonia in sulfuric acid, whereby the nitrogen is utilized as sulfate of ammonia. No use has been imuldcither tor the lime remaining in the residuum after the decomposition or for the nitrogen residues contained in the I'LSltltllll'fl. By such process the price of the product is increased by the introduction of the sulfuric acid and indirectly by the loss of the lime and the nitrogei'i contained in the residuum. It might be advantageous to utilize the lime and small quantities of nitrogen contained in the residuum for the production of nitrate ol lime by adding nitric acid. In this case however nitric acid must be procured, which in most cases would be much too expensive for this use.-

lt is now generally recognized, that the nitrogen contained in nitrates, for instan e nitrate ol' lime, is considerably more valuable than the nitrogen of cyanamid and accordingly it would be very ad vantageous to transfer the cyanamid into We, EMIL CoLLn'rr and subjects of the King of to produce a Christiania, Norway,

Specification of Letters Patent. Application filed April 30'; 1910. Serial Nd. 558,679.

Patented Mar. '7, 1911.

nitrate of lime, if this could be etl'ected without the introduction of foreign substances and Without admixtures, which may be expensive and may also introduce undesirable impurities into the product.

The present invention relates to a process, by which the desired transformation of calcium cyanamid into nitrate of lime isobtained by a novel combination of methods, which are in themselves already known, without use of other substances than those contained in the raw materials, the products obtained at the dilierent steps of the process being utilized in such a way as to incorporate all the lime and nitrogen contained in the calcium cyanamid in the nitrate of lime produced.

. The process is carried out in the following' Way: The nitrogen contained in the calcium cyanamid is transformed into ammonia in a well known manner by decomposition of the cyanamid, preferably for instance by heating the same with aqueous nitrate of lime. This ammonia is then OXldized and transformed into nitrogen oxide or nitric acid, which is obtained in such a quantity as will theoretically correspond to the amount of lime present in the residuum after the decomposition of the cyanamid. This residuum is then subsequently treated with the nitric acid obtained. From the solution of nitrate of lime thus obtained solid nitrate of lime is then produced by known means, whereby the whole amount of the lime employed in nninul'acturing the cyanamid as well as of the nitrogen used is utilized as solid nitrate of lime. The small quantity of nitrogen left in the decomposition residuum being hereby also utilized.

1. The process of converting calcium cyanamid into nitrate of lime which consists in decomposing calcium cyanamid to pro duce ammonia, transforming the ammonia into nitrogen oxids or nitric acid, dissolving the residuum in the nitrogen oxids or nitric acid thereby obtaining a product containing nitrate of lime, all the nitrogen and all the limo containetl in the original calcium cyanamid.

2. The. process ol converting calcium cyanamid into nitrate of lime which comprises transforming the nitrogen contained in the cyanamid, into ammonia, transforming the ammonia into nitrogen oxids or nitric acid,

reacting upon the resithnnn of the decompo- SltlOll ot the cynnnnntl with the nitrogen oxnts or IHtllC nent ohtznneth and thereby producing a. product containing nitrate ot' i lime nlnl nit the time nnzi nit the nitrogen contained in the originti eynnznnitt.

The process of converting; calcium cynnznnid into nitrate of time which comprises transforming llittug wn contained in the ey- 10 zinznnni into ttitti it (t, and reacting therewith upon the residue to form nitrate of time. I

In testimony that we claim the foregoing as our invention, We have signed our names in presence of two subscribing witnesses.

EMIL COLLETT. MORITZ ECKARDT. Witnesses:

HENRY BORDEWICH, II. Gu'ii'ronnsm'. 

